T. H. Soh daffodilistic

Scenario

Synology DS418 on v6.2.4-25556 does not allow shrinking of volumes via the GUI. Thus, this must be done via an SSH terminal. This gist is written as generically as possible so that it works for the general use-case of shrinking volumes formatted with the BTRFS filesystem, and then expanding another one. For this scenario, it's a volume that's being used for Time Machine.

Instructions

SSH into the Synology NAS and switch to root account with sudo su.
Run btrfs filesystem show to list the volumes:

root@SynologyNAS:~# btrfs filesystem show

Steps to achieve a working state for SSH

Backup stock SD card, do not format it yet
Download the UnofficialOS image for R36 clones and follow these instructions. Other OSes might work, but take note that if your device comes with ArkOS as stock, you will need to generate a compatible DTB file which works with non-BSP OSes (see Links/Resources for BSP vs non-BSP Linux builds)
Check that you can boot into Linux and have working D-pad and button controls (you should load into EmuStation after about 1 to 2 minutes of booting up). Depending on your requirements, you might want to ensure the analog sticks are working as well.
Ensure you have a working USB OTG dongle/cable. Plug it into your device (specifically for RX6H, it is the HOST port and not the DC/OTG port).

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